To add drawing: Click the Pottermore icon and go back to 'chapter' pick one of the option. The option is either: places, potions, characters, spells. For example: I pick Chapter 17 moment 3, then choose 'places' => choose 'Hogwarts School of Witchcraft and Wizardry' =>it will show this page: =>Scroll down to the bottom of the page, you'll find 'Add a drawing' button at the right side of the bottom page =>Click on 'Browse' => choose your drawing file => Upload note: some people said that it'll take some time for the drawing to be approved (because the Child Safety rules thing). I hope this post will help you to upload it
ya that does help! thank you! ^^
You're very welcome~